VLSI process compatible 8 bit CMOS DAC

Saul, P.H.; Howard, D.W.; Greenwood, C.

doi:10.1049/ip-i-1.1985.0021

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1989

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Design and optimization of a low DC offset CMOS current-source dedicated to implantable miniaturized stimulators

St-Amand

Savaria

1996

Analog Integr Circ Sig Process

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The main goal of our study is the design of a current-source (CS) based on a miniaturized digital-toanalog converter (DAC). The primary application of this device is a wide range of neuromuscular implantable microstimulators. A great deal of attention was devoted to creating a flexible, compact, and energy efficient circuit. A new design method based on an optimization process involving area and linearity is thus proposed. Circuits obtained using this technique were characterized as having a 5-bit DAC resolution, with 2 mA peak output current, while requiring around 0.01 mm 2 of chip area, using a 1.2/zm CMOS technology. This paper also extends the method to create an improved current-source, designed to minimize the output DC offset and charge accumulation that are noxious for the stimulated neuromuscular tissues. Our analysis of the proposed circuit configuration show that we can reach a small DC offset error, without using any coupling capacitor, which tend to be bulky, and not desirable in highly miniaturized implants.

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